July 2008 - Boost-users - lists.preview.boost.org

MSVC ++ and Boost libraries
by Tony May 07 Jul '08

07 Jul '08

Is it possible to use the pre-built binaries with MSVC++ 2005 express edition? I get the following error from bjam when attempting to build the pyd from the source file hello.cpp. ----------------------------------------------------- hello.cpp has the following code trying to wrap a class BOOST_PYTHON_MODULE(hello_ext) { class_<GreetBase>("GreetBase") # line 50 .def("greet", &GreetBase::greet) ; } -------------------------------------------- hello.cpp(50) : error C2976: 'boost::python::class_' : too few template arguments C:\Program Files\boost\boost_1_35_0\boost/python/def_visitor.hpp(14) : see declaration of 'boost::python::class_' hello.cpp(50) : error C2440: '<function-style-cast>' : cannot convert from 'const char [10]' to 'boost::python::class_' Source or target has incomplete type hello.cpp(50) : error C2228: left of '.def' must have class/struct/union ------------------------------------------------ Do I need to rebuild the boost libraries? Would this be expected to fix the problem?

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asio problem
by River Tarnell 07 Jul '08

07 Jul '08

hi, sorry for the vague question, but i'm not entirely sure what the problem here is... i have a class hierarchy (has-a relationship) like this: fcgi_server_connection +-fcgi_application +-fcgi_cgi fcgi_server_connection has a tcp::socket 'server_socket'. fcgi_cgi has another tcp::socket, 'child_socket'. the program asynchronously reads messages from server_socket then writes them to child_socket, and reads messages from child_socket then writes them to server_socket. (there is some intermediate processing, but i don't think it affects the problem.) the problem occurs when deleting these connections. firstly, fcgi_server_connection is deleted. this deletes fcgi_application, which deletes fcgi_cgi. the sockets are member objects, so they are deleted as part of this. the actual problem is this: sometimes, after a socket is deleted, instead of oustanding read/write operations returning with asio::error::operation_aborted, they return with no error (error==0), but with socket.native() equal to -1. my understanding is that once the socket is deleted, all outstanding operations should be cancelled and operation_aborted should be returned. is this right? if so, what might cause the behaviour i'm seeing? and if not, what am i missing? thanks, - river.

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test framework / greg_month lexical cast segfault - is this fixed?
by Ákos Maróy 07 Jul '08

07 Jul '08

I'm trying to compile and run a very simple unit test using the boost test library on Windows with MinGW, and I'm running into a segfault problem. I searched around the issue, and it seems I've found references to such an issue from 2003: http://lists.boost.org/Archives/boost/2003/09/52920.php and there Jeff Garland says it's been fixed already. has it? I'm thinking it's the same issue based on this ticket: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838 which points to the boost mailing list archive entry above. the test code is simply: #include <boost/test/unit_test.hpp> using namespace boost::unit_test; void test() { BOOST_CHECK(true); } test_suite * init_unit_test_suite(int, char **) { test_suite *ts = BOOST_TEST_SUITE("Test"); ts->add(BOOST_TEST_CASE(&test)); framework::master_test_suite().add(ts); return 0; } compiled with the following Makefile: CFLAGS=-I${INCLUDE_DIR} LDFLAGS=-enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -mthreads -Wl,-subsystem,windows -L${LIB_DIR} test: test.o g++ ${LDFLAGS} test.o -lboost_unit_test_framework-mt -lboost_test_exec_monitor-mt -o test test.o: test.cpp g++ ${CFLAGS} -c -o test.o test.cpp and gdb says: Program received signal SIGSEGV, Segmentation fault. 0x00418e7c in global constructors keyed to _ZN5boost9unit_test64_GLOBAL__N_libs_ test_src_unit_test_monitor.cpp_3F6EE7DC_ED9224E217unit_test_monitorE () (gdb) bt #0 0x00418e7c in global constructors keyed to _ZN5boost9unit_test64_GLOBAL__N_l ibs_test_src_unit_test_monitor.cpp_3F6EE7DC_ED9224E217unit_test_monitorE () #1 0x004273f7 in __main () #2 0x00401c78 in main () this is on a Windows XP box, with gcc 3.4.2 MinGW, using boost 1.35.0 am I doing something wrong? Akos

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Re: [Boost-users] When building should all the libraries have .dylib extensions on mac/unix?
by console shark 07 Jul '08

07 Jul '08

So it seems my problem is that my boost build is not making '.a' versions of all the libraries, only '.dylib' versions. Out of the box it should be building both? Or do I have to configure it to do that? ----- Original Message ---- From: David Philp <david.philp(a)anu.edu.au> To: boost-users(a)lists.boost.org Sent: Sunday, July 6, 2008 10:14:21 PM Subject: Re: [Boost-users] When building should all the libraries have .dylib extensions on mac/unix? On 07/07/2008, at 10:03 AM, console shark wrote: > I just downloaded boost 1.35 and built the standard config. I have a > collection of files in the /lib output folder that all end > in .dylib. I am specifically interested in the python boost library, > which is there as well. > > However the project that I am using that requires this library is > expecting a file that ends with a .so extension. > > Being new to unix/mac I am assuming these are the equivalent > differences between a .dll and .lib file on Windows? See http://developer.apple.com/documentation/Porting/Conceptual/PortingUnix/com… "dylib" is the usual Apple extension for a dynamically linked library, and "so" is the usual Linux / etc extension. They are otherwise the same thing. You should be able to use the .dylib file in place of the .so file. > In any case how do I get the .so or static lib version of python > boost? .a is the usual extension for statically linked libraries on Macs and Linux. (a being "archive") I have a libboost_python.a in the same place as libboost_python.dylib. AIUI .a is similar to .lib, and .so / .dylib are similar to .dll: they have similar roles, but there are important differences. D _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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[BGL] tree structure
by M. Siebeneicher 07 Jul '08

07 Jul '08

Hello list members, I'm evaluating the bgl library of boost for a while. Now I'm interessted in the question how to use bgl for managing a n-tree data structure. Is there a graph which checks if an existing vertex has an in-edge and prevents adding a second one? With kind regards, Manuel Siebeneicher -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

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boost::asio breaks my DLL
by Simon Pickles 07 Jul '08

07 Jul '08

Hi, I am using boost 1.35 on MSVC2005, WinXP SP2, with the prebuilt boost libraries from www.boostpro.com. When trying to create a DLL, everything builds correctly. The DLL is correctly loaded by the exe, and the imported functions are visible. That is, until I add #include "boost//asio.hpp" to the DLL source. It still compiles and links, but at runtime I now get this error: LDR: LdrpWalkImportDescriptor() failed to probe x:\simon\Dev\xpworkingcopy\trunk\client\lib\Network.dll for its manifest, ntstatus 0xc0150002 This suggests the DLL has not had all its dependencies fulfilled, correct? I've tried putting boost_system-vc80-mt-gd-1_35.dll in my working directory, but no change. Can anyone help me? Thanks so much! Simon -- Linux Counter: User# 424693

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Converting an std::vector to std::wstring
by Sean Farrow 07 Jul '08

07 Jul '08

Hi: What is the best way (in terms of efficiency) to convert an std::vector of wchar_t to std::wstring. I can think of a oupple of aproaches: 1. using std::copy. 2. using boost::lexical_cast. 3 using boost::foreach 4. Usin he boost::serialization library. The std::wstring doesn't ned to be output to a file. Any advice apreciated. Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3244 (20080705) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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When building should all the libraries have .dylib extensions on mac/unix?
by console shark 07 Jul '08

07 Jul '08

I just downloaded boost 1.35 and built the standard config. I have a collection of files in the /lib output folder that all end in .dylib. I am specifically interested in the python boost library, which is there as well. However the project that I am using that requires this library is expecting a file that ends with a .so extension. Being new to unix/mac I am assuming these are the equivalent differences between a .dll and .lib file on Windows? In any case how do I get the .so or static lib version of python boost? Many thanks

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[Boost.Test] Compiling on Mac OS X
by Florian Winter 07 Jul '08

07 Jul '08

Hi, We have run into problems trying to compile Boost.Test on a Mac OS X 10.3 system using GCC version 3.3 (details below). We are using the "included" implementation of Boost.Test in a shared library that we build using our own build system. This works fine on various different platforms and compilers, however part of Boost.Test fails to compile on Mac OS X. We are including Boost.Test in our shared library in the following way: // Define this to declare all Boost.Test symbols as __declspec(dllexport) // rather than __declspec(dllimport). #define BOOST_TEST_SOURCE #define BOOST_TEST_DYN_LINK #include <boost/test/included/unit_test.hpp> The compiler errors (see below) indicate that some symbols related to signal handling are undefined. Either, some required system headers are not included, or these symbols are not portable and not available on Mac OS X (10.3). Has this problem been encountered before? Is there an easy workaround for it, such as defining certain symbols before including the Boost.Test headers? Could it be somehow related to the way we are building Boost.Test? Furthermore, it would be interesting for us to know what the status of Boost.Test on Mac OS X is in general. Unfortunately, the "Portability" section in the documentation http://www.boost.org/doc/libs/1_35_0/libs/test/doc/portability.html as well as the rest of the documentation do not provide a lot of information regarding support for different platforms. Below, you will find the error messages that we got, as well as some information about our system and the version of Boost.Test that we used. Thanks in advance for any help. Best regards, Florian *Boost Version* 1.35.0 *System* MacOSX 10.3 *Compiler* g++ (GCC) 3.3 20030304 (Apple Computer, Inc. build 1666) Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *Errors* In file included from <...>/boost/test/included/unit_test.hpp:22, from <...>:18: <...>/boost/test/impl/execution_monitor.ipp: In member function `void boost::detail::system_signal_exception::report() const': <...>/boost/test/impl/execution_monitor.ipp:286: error: `ILL_ILLOPN' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:286: error: (Each undeclared identifier is reported only once for each function it appears in.) <...>/boost/test/impl/execution_monitor.ipp:291: error: `ILL_ILLADR' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:306: error: `ILL_PRVREG' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:311: error: `ILL_COPROC' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:316: error: `ILL_BADSTK' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:326: error: `FPE_INTDIV' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:331: error: `FPE_INTOVF' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:361: error: `FPE_FLTSUB' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:391: error: `BUS_ADRERR' undeclared (first use this function) <...>/boost/test/impl/execution_monitor.ipp:396: error: `BUS_OBJERR' undeclared (first use this function)

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[BGL] why not breakup put_get_helper into three structs?
by Mostafa 06 Jul '08

06 Jul '08

Helllo, I was wondering why put_get_helper shouldn't be three structs (put_helper, get_helper, put_get_helper, with the latter deriving from from the formers) instead of one? My rationale is outlined below along with the proposed code. //Begin Rationale Problem: want a helper method for readable property maps. Solution1: use exist boost::put_get_helper and just never use the put function. Problem with solution 1: 1) the put function will still be "callable", and 2) calling the put function will result in an invalid assignment to a read-only variable compiler error, which is cryptic to decipher, ie, that even though the put function does exist it should not be called. The only way to clarify this would be via documentation, which then brings about the problem of keeping code in sync with comments. Solution2: make a helper method for readable property maps that won't make the put companion function a valid function call, ie, break up boost::put_get_helper to put_helper, get_helper, and put_get_helper which derives from the latter two. Problems with solution 2: None that I can see. Advantages of solution 2: 1) It's self-documenting whether the put or get functions are intended to be called, ie if I derive from get_helper then it's self-evident that I shouldn't be calling the put function (vice versa); and 2) given the above scenario, even if by chance the put function get's called the compiler error message will be easier to decipher, ie, something along the lines of: <no matching function for call to ‘put(...)'>. 3) Not really an advantage, but ... backward compatibility is maintained. //End Rationale. //Proposed code adapted from boost/property_map.hpp // A helper class for constructing a property map // from a class that implements operator[] template <class RetVal, class RvaluePropertyMap> struct get_helper { }; template <class LvaluePropertyMap> struct put_helper { }; template <class RetVal, class LvaluePropertyMap> struct put_get_helper : public put_helper<LvaluePropertyMap>, public get_helper<RetVal, LvaluePropertyMap> { }; template <class PropertyMap, class RetVal, class K> inline RetVal get( get_helper<RetVal, PropertyMap> const & pa, K const & k) { RetVal v = static_cast<const PropertyMap&>(pa)[k]; return v; } template <class PropertyMap, class K, class V> inline void put( put_helper<PropertyMap> const & pa, K k, V const & v) { static_cast<const PropertyMap&>(pa)[k] = v; } Thanks in advance, -Mostafa

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